What is it supposed to mean?

[Aj]

So I drew a picture of my celebrity idol on Twitter and she replied saying;

'Not mad at it! Thanks for being generous with the cleavage.'

What does she mean when she says 'Not mad at it.'?

[J.J.]

She's not upset with it even though she thinks it is not an accurate reflexion of her true self. She feels that you have exaggerated her cleavage but she likes your version.

[eagercemetery982]

When you tweeted it, did you say something along the lines of "Hope you won't be mad that I drew a pic of you?" That is the only way I can make sense of what she wrote. Otherwise it might be a typo.

[elizabeth]

She could of meant not bad at it? Type error maybe?